I added my account to my uncles so now we're doing family sharing, I recently got an Apple iTunes card for 15$ and can't use it because when I try to purchase something it goes to his credit card info to verify the purchase through him but I have credit so what's going. I'm getting fed up
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If you redeem the card on your appleId, it will use up the credit on your appleId first. – Tyson Jan 1 '16 at 1:14
You need to hit redeem in the App Store. If your account is logged in, then the credit will go to your account. And apple will use the credit first.